a6d178b6af
This can happen if RRTellChanged is called during initialization. Continuing in that case makes no sense conceptually: * Any event sent over the wire requires a corresponding window. * No root window probably means there can't be any clients which could receive the events. In practice, it would result in a crash down the road due to dereferencing the NULL ScreenRec::root pointer. Reviewed-by: Olivier Fourdan <ofourdan@redhat.com>
X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
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